** Description changed:

+ [impact]
+ docker.io now prompts on upgrade as to whether to restart, which is an 
improvement, but there is no way to decide ahead of time for a non-interactive 
upgrade.
+ 
+ [test case]
+ # apt install docker.io
+ # dpkg-reconfigure docker.io 
+ < this will only ask a question once the bug is fixed >
+ < choose yes >
+ # DEBIAN_FRONTEND=noninteractive apt install --reinstall docker.io 
+ < check dockerd has restarted >
+ # dpkg-reconfigure docker.io 
+ < choose no >
+ # DEBIAN_FRONTEND=noninteractive apt install --reinstall docker.io 
+ < check dockerd has not restarted>
+ 
+ [regression potential]
+ The change implementing this clearly only affects install/upgrade scenarios: 
https://github.com/tianon/debian-docker/commit/4bc8afa9594ca51d2707cfbf0cc682e68b215c68.
 The test case above covers these.
+ 
+ Also we don't care much about regressions in docker.io!
+ https://wiki.ubuntu.com/DockerUpdates
+ 
+ [original description]
+ 
  Currently if I run "dpkg-reconfigure docker.io" it doesn't present me
  with any option to restart the package on upgrade. Looking at the debian
  post install file, it should, and lp#1668621 suggests it should.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: docker.io 17.03.2-0ubuntu2~16.04.1
  ProcVersionSignature: User Name 4.15.0-29.31-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  Date: Tue Jul 31 10:15:21 2018
  ProcEnviron:
-  TERM=xterm-256color
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm-256color
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  SourcePackage: docker.io
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1784602

Title:
  No option to configure docker.io for restart on package upgrade

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